Re: [whatwg/fetch] Specify exception to redirect-tainting: Upgrade-Insecure-Requests (UIR) and HSTS scheme upgrades (Issue #1551)

That covers the initial request (including the minimal test case from my report in Firefox).

In case of repeated redirects, the same-origin check (step 9 and step 13) and redirect chain construction (step 18) happen before the "main fetch" step:
https://fetch.spec.whatwg.org/#http-redirect-fetch

Consequently, despite the requests being always over https, some parts of the specified algorithm treat the request as http.

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Received on Monday, 28 November 2022 12:39:56 UTC